A backdoor Roth IRA is a way to put money into a Roth account when your income is too high for the IRS to let you contribute directly
The IRS sets income limits on who can contribute to a Roth IRA. If you earn more than that limit in a given year, you cannot put money into a Roth directly. A backdoor Roth gets around this by using a two-step process: you contribute to a traditional IRA first (which has no income limit), then convert that money to a Roth IRA. The conversion itself is allowed regardless of how much you earn.
This is legal and the IRS knows about it. Thousands of high-income earners do this every year. But it requires following the steps in the right order and watching out for a specific tax trap called the pro-rata rule, which can create an unexpected tax bill if you have other traditional IRA money sitting around.
Key Takeaways
- A backdoor Roth works in two steps: contribute to a traditional IRA, then convert it to a Roth IRA within a few days or weeks.
- You can do this even if your income exceeds the Roth contribution limit, because conversions have no income cap.
- The pro-rata rule means if you have any other traditional IRA, SEP IRA, or straightforward IRA balances, the IRS will tax part of your conversion based on the ratio of pre-tax to after-tax money across all your IRAs.
- You report the conversion on Form 8606 when you file your tax return, and you may owe taxes on the converted amount depending on your other IRA balances.
- The backdoor Roth is most useful if you have no other traditional IRA money and want to save more than the annual Roth limit allows.
Why income limits exist and how the backdoor bypasses them
The Roth IRA was created to let people save money that grows tax-free. To keep the benefit available to middle-income savers, Congress set income limits. In 2024, for example, you cannot contribute to a Roth if you are a single filer earning over $146,000 (the limit phases out starting at $139,000). For married couples filing jointly, the limit is $230,000 (phasing out from $214,000).
These limits explore only to direct contributions. The law does not restrict conversions from traditional IRAs to Roth IRAs based on income. So if you earn $200,000 and cannot contribute directly, you can put $7,000 into a traditional IRA and when ready convert it to a Roth. The IRS sees this as a legal strategy, not a loophole.
The reason this works is that a traditional IRA contribution and a Roth conversion are two separate tax events. The contribution itself may or may not be deductible depending on your income and whether you have a workplace retirement plan. The conversion is taxable in the year you do it, but it is allowed regardless of your earnings.
The pro-rata rule: the hidden cost of having other IRA money
The biggest gotcha in a backdoor Roth is the pro-rata rule. If you have any balance in a traditional IRA, SEP IRA, or straightforward IRA at the end of the year in which you convert, the IRS treats all your IRAs as one pool for tax purposes. It then calculates what percentage of that pool is pre-tax money (money you deducted when you contributed) and taxes that same percentage of your conversion.
Here is a concrete example: suppose you have a traditional IRA with $90,000 in pre-tax contributions sitting from years past. You contribute $7,000 to a new traditional IRA (after-tax, because you cannot deduct it due to income limits) and convert it to a Roth the same week. The IRS looks at your total IRA balance: $97,000. Of that, $90,000 is pre-tax and $7,000 is after-tax. That means 92.8% of your pool is pre-tax. When you convert the $7,000, the IRS taxes you on 92.8% of it — about $6,500 — even though you only converted after-tax money.
This rule applies across all your IRAs in a single tax year. It does not matter if the pre-tax money is in a different IRA or a different institution. The IRS counts them all together. If you have a rollover IRA from an old 401(k), a SEP IRA from self-employment income, or a traditional IRA from years ago, those balances all factor into the calculation.
The steps to execute a backdoor Roth correctly
The process itself is straightforward, but timing and order matter. Here is what to do:
- Contribute $7,000 (or $8,000 if you are 50 or older) to a traditional IRA. Make sure the contribution is for the current tax year. You can do this at any brokerage that offers IRAs — Fidelity, Vanguard, Charles Schwab, and others all support it.
- Wait a few days for the contribution to settle. You do not have to wait long, but let the money clear in the account.
- Convert the entire balance of that traditional IRA to a Roth IRA. You can convert to an existing Roth or open a new one. Most people do the conversion within a week or two of the contribution.
- Keep records of the contribution. Save the confirmation from your brokerage showing the traditional IRA contribution and the conversion. You will need this for your tax return.
- File Form 8606 with your tax return in April. This form tells the IRS about your nondeductible contribution and conversion. It is where the pro-rata rule gets calculated if you have other IRA balances.
Do not wait until the end of the year to do this. If you contribute in December and convert in January of the following year, the IRS treats it as a conversion in the new year, and you will have to account for any IRA balances as of December 31 of the prior year. Doing the contribution and conversion in the same calendar year keeps things simpler.
What happens to your money after conversion
Once the money is in the Roth IRA, it grows tax-free. You do not pay taxes on dividends, capital gains, or interest earned inside the Roth. When you withdraw the money in retirement (after age 59½ and at least five years after your first Roth contribution), those withdrawals are tax-free.
You also do not have to take required minimum distributions from a Roth IRA during your lifetime, unlike traditional IRAs. This makes a Roth useful if you do not need the money and want to leave it to heirs, since they inherit an account that will continue growing tax-free.
The $7,000 (or $8,000) you convert counts toward your annual Roth contribution limit. If you have already made a direct Roth contribution earlier in the year, the conversion reduces how much more you can contribute directly. Most people who do backdoor Roths have already hit the income limit, so this does not matter, but it is worth checking.
When a backdoor Roth does not make sense
If you have a large balance in a traditional IRA, SEP IRA, or straightforward IRA, a backdoor Roth can trigger a big tax bill due to the pro-rata rule. In that case, you might be better off leaving the money where it is or exploring other options like a mega backdoor Roth (if your employer plan allows it) or straightforward maxing out a 401(k) instead.
If your income is below the Roth limit, you do not need a backdoor Roth at all. You can contribute directly and avoid the extra paperwork and the pro-rata risk.
If you are self-employed or have a side business, you might have access to a SEP IRA or Solo 401(k), which can let you save much more than $7,000 per year. In that case, a backdoor Roth may not be your best strategy, especially if you are trying to minimize taxes.
Reporting the backdoor Roth on your tax return
You report a backdoor Roth using Form 8606, which is filed with your 1040. This form has two main purposes: it records your nondeductible contribution to the traditional IRA, and it calculates the taxable portion of your conversion if the pro-rata rule applies.
If you have no other IRA balances, Form 8606 is straightforward. You enter the amount you contributed and the amount you converted, and since they are the same and there is no pre-tax money involved, the taxable amount is zero. If you do have other IRA balances, the form walks you through the pro-rata calculation.
Your brokerage will send you a Form 1099-R reporting the conversion. Make sure the amount on that form matches your records. If there is a discrepancy, contact the brokerage to correct it before you file.
Frequently Asked Questions
Can I do a backdoor Roth if I have a 401(k) at work?
Yes. The pro-rata rule applies only to IRAs (traditional, SEP, and straightforward), not to 401(k)s or other employer plans. If all your retirement savings are in a 401(k), you can do a backdoor Roth without any pro-rata issue. If you also have an IRA, the rule applies to the IRA balance only.
What if I convert the money but do not report it on Form 8606?
The IRS will eventually notice. Your brokerage reports the conversion on Form 1099-R, and the IRS matches that to your return. If Form 8606 is missing, the IRS may assume the entire converted amount is taxable, which could result in a larger tax bill than you owe. Filing an amended return with Form 8606 can fix this, but it is better to file it correctly the first time.
Can I do a backdoor Roth for my spouse?
Yes, if your spouse has earned income. Each person can contribute up to $7,000 per year (or $8,000 if 50 or older) to their own backdoor Roth. Your spouse files their own Form 8606 on their tax return. If your spouse has IRA balances, the pro-rata rule applies to their IRAs separately from yours.
How long do I have to wait between the contribution and the conversion?
There is no IRS rule requiring a waiting period. You can contribute and convert the same day if you want. However, some people wait a few days to let the contribution settle and to create a clear paper trail. The timing does not affect the tax outcome as long as both happen in the same calendar year.
What if the market drops between my contribution and conversion?
You still owe taxes on the full amount you contributed, not the lower value after the drop. If you contributed $7,000 and it drops to $6,500 before you convert, you still report a $7,000 conversion for tax purposes. The loss is locked in, but you can claim it as a miscellaneous deduction in some cases — ask a tax professional about your specific situation.